Brushes appear slightly transparent and my colours paint over or on top of each other.

For the life of me I cannot figure out why my photoshop CC is doing this. I don't know if it is going to be a simple fix or not. My opacity is at 100% and my blend mode is at normal but when I paint with the brush it looks like it is transparent and my colors paint under each other. Here is a screen shot. http://gyazo.com/c89230f3851b8f8d82799d6036e7819c

This had happened to me once before I don't know how I got it to stop. Hope someone knows how to fix this.